Re: [PATCH 7/7] drm/i915/guc: Selftest for stealing of guc ids

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On 12/10/2021 16:56, Matthew Brost wrote:
Testing the stealing of guc ids is hard from user spaec as we have 64k
spaec -> space

guc_ids. Add a selftest, which artificially reduces the number of guc
ids, and forces a steal. Details of test has comment in code so will not
has -> are

But would a copy&paste really be so hard? It is useful to be able to read what a patch does from the commit log and not have to delve inside every time.


repeat here.

Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
  drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  12 ++
  .../gpu/drm/i915/gt/uc/intel_guc_submission.c |  15 +-
  drivers/gpu/drm/i915/gt/uc/selftest_guc.c     | 171 ++++++++++++++++++
  3 files changed, 193 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.h b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
index 1cb46098030d..307380a2e2ff 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.h
@@ -94,6 +94,11 @@ struct intel_guc {
  		 * @guc_ids: used to allocate new guc_ids, single-lrc
  		 */
  		struct ida guc_ids;
+		/**
+		 * @num_guc_ids: Number of guc_ids, selftest feature to be able
+		 * to reduce this number of test.
of test -> while testing

Should have a CONFIG_SELFTEST around it? And define a wrapper that is GUC_MAX_LRC_DESCRIPTORS or num_guc_ids as appropriate.


+		 */
+		int num_guc_ids;
  		/**
  		 * @guc_ids_bitmap: used to allocate new guc_ids, multi-lrc
  		 */
@@ -202,6 +207,13 @@ struct intel_guc {
  		 */
  		struct delayed_work work;
  	} timestamp;
+
+#ifdef CONFIG_DRM_I915_SELFTEST
+	/**
+	 * @number_guc_id_stole: The number of guc_ids that have been stole
+	 */
+	int number_guc_id_stole;
stole -> stolen (in all three cases)

+#endif
  };
static inline struct intel_guc *log_to_guc(struct intel_guc_log *log)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index 96fcf869e3ff..57019b190bfb 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -145,7 +145,7 @@ guc_create_parallel(struct intel_engine_cs **engines,
   * use should be low and 1/16 should be sufficient. Minimum of 32 guc_ids for
   * multi-lrc.
   */
-#define NUMBER_MULTI_LRC_GUC_ID		(GUC_MAX_LRC_DESCRIPTORS / 16)
+#define NUMBER_MULTI_LRC_GUC_ID(guc)	(guc->submission_state.num_guc_ids / 16)
And keep the original definition for the non CONFIG_SELFTEST case?

/*
   * Below is a set of functions which control the GuC scheduling state which
@@ -1775,7 +1775,7 @@ int intel_guc_submission_init(struct intel_guc *guc)
  		  destroyed_worker_func);
guc->submission_state.guc_ids_bitmap =
-		bitmap_zalloc(NUMBER_MULTI_LRC_GUC_ID, GFP_KERNEL);
+		bitmap_zalloc(NUMBER_MULTI_LRC_GUC_ID(guc), GFP_KERNEL);
  	if (!guc->submission_state.guc_ids_bitmap)
  		return -ENOMEM;
@@ -1869,13 +1869,13 @@ static int new_guc_id(struct intel_guc *guc, struct intel_context *ce) if (intel_context_is_parent(ce))
  		ret = bitmap_find_free_region(guc->submission_state.guc_ids_bitmap,
-					      NUMBER_MULTI_LRC_GUC_ID,
+					      NUMBER_MULTI_LRC_GUC_ID(guc),
  					      order_base_2(ce->parallel.number_children
  							   + 1));
  	else
  		ret = ida_simple_get(&guc->submission_state.guc_ids,
-				     NUMBER_MULTI_LRC_GUC_ID,
-				     GUC_MAX_LRC_DESCRIPTORS,
+				     NUMBER_MULTI_LRC_GUC_ID(guc),
+				     guc->submission_state.num_guc_ids,
  				     GFP_KERNEL | __GFP_RETRY_MAYFAIL |
  				     __GFP_NOWARN);
  	if (unlikely(ret < 0))
@@ -1941,6 +1941,10 @@ static int steal_guc_id(struct intel_guc *guc, struct intel_context *ce)
set_context_guc_id_invalid(cn); +#ifdef CONFIG_DRM_I915_SELFTEST
+		guc->number_guc_id_stole++;
+#endif
+
  		return 0;
  	} else {
  		return -EAGAIN;
@@ -3779,6 +3783,7 @@ static bool __guc_submission_selected(struct intel_guc *guc)
void intel_guc_submission_init_early(struct intel_guc *guc)
  {
+	guc->submission_state.num_guc_ids = GUC_MAX_LRC_DESCRIPTORS;
  	guc->submission_supported = __guc_submission_supported(guc);
  	guc->submission_selected = __guc_submission_selected(guc);
  }
diff --git a/drivers/gpu/drm/i915/gt/uc/selftest_guc.c b/drivers/gpu/drm/i915/gt/uc/selftest_guc.c
index fb0e4a7bd8ca..9ab355e64b3f 100644
--- a/drivers/gpu/drm/i915/gt/uc/selftest_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/selftest_guc.c
@@ -3,8 +3,21 @@
   * Copyright �� 2021 Intel Corporation
   */
+#include "selftests/igt_spinner.h"
  #include "selftests/intel_scheduler_helpers.h"
+static int request_add_spin(struct i915_request *rq, struct igt_spinner *spin)
+{
+	int err = 0;
+
+	i915_request_get(rq);
+	i915_request_add(rq);
+	if (spin && !igt_wait_for_spinner(spin, rq))
+		err = -ETIMEDOUT;
+
+	return err;
+}
+
  static struct i915_request *nop_user_request(struct intel_context *ce,
  					     struct i915_request *from)
  {
@@ -110,10 +123,168 @@ static int intel_guc_scrub_ctbs(void *arg)
  	return ret;
  }
+/*
+ * intel_guc_steal_guc_ids - Test to exhaust all guc_ids and then steal one
+ *
+ * This test creates a spinner to which is used as to block all subsequent
to which -> which
as to block -> to block

+ * submissions until it completes. Next, a loop creates a context and a NOP
+ * request each iteration until the guc_ids are exhausted (request creation
+ * returns -EAGAIN). The spinner is completed unblocking all requests created in
spinner is ended,

+ * the loop. At this point all guc_ids are exhausted but are available to steal.
+ * Try to create another request which should successfully steal a guc_id. Wait
+ * on last request to complete, idle GPU, verify guc_id was stole via counter,
stole -> stolen

+ * and exit test. Test also artificially reduces the number of guc_ids so the
+ * test runs in a timely manner.
+ */
+static int intel_guc_steal_guc_ids(void *arg)
+{
+	struct intel_gt *gt = arg;
+	struct intel_guc *guc = &gt->uc.guc;
+	int ret, sv, i = 0;
+	intel_wakeref_t wakeref;
+	struct intel_engine_cs *engine;
+	struct intel_context **ce;
+	struct igt_spinner spin;
+	struct i915_request *spin_rq = NULL, *rq, *last = NULL;
+	int number_guc_id_stole = guc->number_guc_id_stole;
stole -> stolen

+
+	ce = kzalloc(sizeof(*ce) * GUC_MAX_LRC_DESCRIPTORS, GFP_KERNEL);
+	if (!ce) {
+		pr_err("Context array allocation failed\n");
+		return -ENOMEM;
+	}
+
+	wakeref = intel_runtime_pm_get(gt->uncore->rpm);
+	engine = intel_selftest_find_any_engine(gt);
+	sv = guc->submission_state.num_guc_ids;
+	guc->submission_state.num_guc_ids = 4096;
+
+	/* Create spinner to block requests in below loop */
+	ce[i++] = intel_context_create(engine);
+	if (IS_ERR(ce[i - 1])) {
+		ce[i - 1] = NULL;
+		ret = PTR_ERR(ce[i - 1]);
Would be less peculiar looking to do the i++ after the if statement.

+		pr_err("Failed to create context: %d\n", ret);
+		goto err_wakeref;
+	}
+	ret = igt_spinner_init(&spin, engine->gt);
+	if (ret) {
+		pr_err("Failed to create spinner: %d\n", ret);
+		goto err_contexts;
+	}
+	spin_rq = igt_spinner_create_request(&spin, ce[i - 1], MI_ARB_CHECK);
+	if (IS_ERR(spin_rq)) {
+		ret = PTR_ERR(spin_rq);
+		pr_err("Failed to create spinner request: %d\n", ret);
+		goto err_contexts;
+	}
+	ret = request_add_spin(spin_rq, &spin);
+	if (ret) {
+		pr_err("Failed to add Spinner request: %d\n", ret);
+		goto err_spin_rq;
+	}
+
+	/* Use all guc_ids */
+	while (ret != -EAGAIN) {
+		ce[i++] = intel_context_create(engine);
+		if (IS_ERR(ce[i - 1])) {
+			ce[i - 1] = NULL;
+			ret = PTR_ERR(ce[i - 1]);
+			pr_err("Failed to create context: %d\n", ret);
+			goto err_spin_rq;
Won't this try to put the null context? Or rather will see the null context and immediately abort the clean up loop. Need to do the i++ after the if statement. Or after the nop_user_request call to get rid of all the ce[i - 1] things.

John.

+		}
+
+		rq = nop_user_request(ce[i - 1], spin_rq);
+		if (IS_ERR(rq)) {
+			ret = PTR_ERR(rq);
+			rq = NULL;
+			if (ret != -EAGAIN) {
+				pr_err("Failed to create request, %d: %d\n", i,
+				       ret);
+				goto err_spin_rq;
+			}
+		} else {
+			if (last)
+				i915_request_put(last);
+			last = rq;
+		}
+	}
+
+	/* Release blocked requests */
+	igt_spinner_end(&spin);
+	ret = intel_selftest_wait_for_rq(spin_rq);
+	if (ret) {
+		pr_err("Spin request failed to complete: %d\n", ret);
+		i915_request_put(last);
+		goto err_spin_rq;
+	}
+	i915_request_put(spin_rq);
+	igt_spinner_fini(&spin);
+	spin_rq = NULL;
+
+	/* Wait for last request */
+	ret = i915_request_wait(last, 0, HZ * 30);
+	i915_request_put(last);
+	if (ret < 0) {
+		pr_err("Last request failed to complete: %d\n", ret);
+		goto err_spin_rq;
+	}
+
+	/* Try to steal guc_id */
+	rq = nop_user_request(ce[i - 1], NULL);
+	if (IS_ERR(rq)) {
+		ret = PTR_ERR(rq);
+		pr_err("Failed to steal guc_id, %d: %d\n", i, ret);
+		goto err_spin_rq;
+	}
+
+	/* Wait for last request */
+	ret = i915_request_wait(rq, 0, HZ);
+	i915_request_put(rq);
+	if (ret < 0) {
+		pr_err("Last request failed to complete: %d\n", ret);
+		goto err_spin_rq;
+	}
+
+	/* Wait for idle */
+	ret = intel_gt_wait_for_idle(gt, HZ * 30);
+	if (ret < 0) {
+		pr_err("GT failed to idle: %d\n", ret);
+		goto err_spin_rq;
+	}
+
+	/* Verify a guc_id got stole */
+	if (guc->number_guc_id_stole == number_guc_id_stole) {
+		pr_err("No guc_ids stolen");
+		ret = -EINVAL;
+	} else {
+		ret = 0;
+	}
+
+err_spin_rq:
+	if (spin_rq) {
+		igt_spinner_end(&spin);
+		intel_selftest_wait_for_rq(spin_rq);
+		i915_request_put(spin_rq);
+		igt_spinner_fini(&spin);
+		intel_gt_wait_for_idle(gt, HZ * 30);
+	}
+err_contexts:
+	while (i && ce[--i])
+		intel_context_put(ce[i]);
+err_wakeref:
+	intel_runtime_pm_put(gt->uncore->rpm, wakeref);
+	kfree(ce);
+	guc->submission_state.num_guc_ids = sv;
+
+	return ret;
+}
+
  int intel_guc_live_selftests(struct drm_i915_private *i915)
  {
  	static const struct i915_subtest tests[] = {
  		SUBTEST(intel_guc_scrub_ctbs),
+		SUBTEST(intel_guc_steal_guc_ids),
  	};
  	struct intel_gt *gt = &i915->gt;




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